JP6575767B2 - Intermittent structure of fuse for dark current circuit - Google Patents

Description

  The present invention relates to an intermittent structure of a dark current circuit fuse for intermittently connecting a dark current circuit provided in an electric junction box or the like of an automobile.

  Conventionally, electrical connection boxes such as junction boxes and fuse boxes mounted on automobiles have a circuit that consumes constant power (such as watches) to prevent battery consumption when operation is stopped for a long time In some cases, an intermittent structure of the dark current circuit is provided that can cut off the dark current circuit. For example, in JP-A-7-169382 (Patent Document 1), a fuse holder that holds a dark current circuit fuse can be slidably displaced in the insertion / removal direction with respect to a case that houses the dark current circuit. The dark current circuit fuse can be held so as to be switchable between a connection position where the dark current circuit fuse is connected to the dark current circuit and a cut position where the dark current circuit fuse is disconnected from the dark current circuit.

  By the way, in the intermittent structure of the dark current circuit fuse disclosed in Patent Document 1, the fuse holder is structured to stably support the dark current circuit fuse by surrounding the front and rear surfaces and the left and right sides. On the side, it is necessary to provide an insertion region for the fuse holder all around the fuse cavity in which the dark current circuit fuse is accommodated.

  However, due to recent demands for miniaturization and high density of the electrical junction box, it may be difficult to provide a fuse holder insertion region around the fuse cavity. Therefore, as shown in FIG. 1 of JP-A-5-342979 (Patent Document 2), a fuse holder insertion region is provided only on one long side of the fuse cavity, and the fuse cavity of the flat plate-like fuse holder is provided. Is provided with a fuse holding portion that covers three sides of the head of the dark current circuit fuse and opens to one side, and the flange portion of the head of the dark current circuit fuse is provided on the inner peripheral surface of the fuse holding portion. It is conceivable to employ a structure in which an insertion groove for engaging and supporting is provided, and a flange portion is inserted into the insertion groove from one side opening so that the dark current circuit fuse can be slid into the fuse holding portion.

  However, in order to allow the dark current fuse to be slid into the fuse holder, a certain gap is required between the fuse holder and the dark current fuse. Therefore, it is inevitable that the dark current fuse will rattle in the fuse holding part, and the holding position of the terminal of the dark current circuit fuse held in the fuse holding part is disposed in the fuse cavity due to overlap of dimensional tolerances, etc. There was a risk of displacement with respect to the connection terminal on the dark current circuit side. As a result, when the fuse holder is slid to the connection position, the dark current circuit fuse terminal may not be smoothly connected to the connection terminal on the dark current circuit side, which may cause deterioration of workability or damage. there were.

JP 7-169382 A JP-A-5-342979

  The present invention has been made in the background of the above-described circumstances, and the problem to be solved is that the dark current circuit fuse is stably positioned and supported by the fuse holder, and the fuse holder is slid to the connection position. It is an object of the present invention to provide a novel dark current circuit fuse intermittent structure that can smoothly connect the dark current circuit fuse terminal to the dark current circuit side connection terminal.

  According to a first aspect of the present invention, a fuse holder that holds a dark current circuit fuse that is conductively connected to the dark current circuit is displaced with respect to a case that accommodates the dark current circuit in the insertion / extraction direction of the dark current circuit fuse. A connection position where the dark current circuit fuse is conductively connected to the connection terminal of the dark current circuit housed in the fuse cavity of the case, and the dark current circuit fuse is disconnected from the connection terminal. A fuse holder insertion region is provided on one long side of the fuse cavity in the case, and the fuse in the flat plate insertion portion of the fuse holder is provided. Cover the front, rear, and first side of the head of the dark current circuit fuse on the front side of the surface facing the cavity, and on the second side In the intermittent structure of the dark current circuit fuse, provided with a fuse holding portion having a port window, the fuse holding portion covers a front wall that covers the front surface of the head of the dark current circuit fuse, and a rear surface of the fuse. While having a rear wall and a side wall covering the first side surface, the front wall and the rear wall of the fuse holding portion are in contact with the central portion in the width direction of the dark current circuit fuse. A pair of central press-contact ribs extending in a direction projecting from each other in the thickness direction of the dark current circuit fuse, and are provided on one of the front wall and the rear wall of the fuse holding portion. Is provided at a position spaced apart from the central press-contact rib by a predetermined distance in the width direction of the dark current circuit fuse, and is in contact with one end in the width direction of the dark current circuit fuse. One that is provided with ribs The other of the front wall and the rear wall of the fuse holding portion is provided at a position separated by the same predetermined distance on the opening window side than the central press-contact rib in the width direction of the dark current circuit fuse. The second side press-contact rib that contacts the other end in the width direction of the dark current circuit fuse is provided with the same projecting height as the first side press-contact rib.

  According to this aspect, the insertion region of the fuse holder is provided on one long side portion side of the fuse cavity in the case, and the dark current circuit is provided on the tip portion side of the surface facing the fuse cavity in the flat plate insertion portion of the fuse holder. On the front and rear walls of the fuse holder, assuming a structure with a fuse holder that allows the dark current circuit fuse to be slid and inserted through the opening window on one side while protecting the top surface of the fuse fuse A pair of central press-contact ribs that abut on the central portion in the width direction of the dark current circuit fuse and extend in the height direction protrude from each other in the thickness direction of the dark current circuit fuse. As a result, the dark current circuit is provided between the central press-contact ribs projecting from the front wall and the rear wall so that the dark current circuit fuse can be slid into the fuse holding portion. Therefore, the dark current circuit fuse held in the fuse holding portion can be prevented from being loosened and stably held.

  In addition, the first side pressure welding rib provided on one of the front wall and the rear wall of the fuse holding portion and the second side pressure welding rib provided on the other have the same separation height while maintaining the same separation distance from the central pressure welding rib. And spaced apart from the central press rib in the width direction of the fuse in opposite directions. Accordingly, it is possible to reliably center the dark current circuit fuse at the center position of the fuse holding portion while suppressing an increase in insertion force when the dark current circuit fuse is slid into the fuse holding portion. As a result, when the fuse holder is slid to the connection position, the terminal of the dark current circuit fuse can be smoothly connected to the connection terminal on the dark current circuit side. Damage can be prevented.

  According to a second aspect of the present invention, there is provided the dark current according to the first aspect, wherein the fuse holding portion abuts against a flange portion of the head of the dark current circuit fuse from below. It has a support part which supports the fuse for a circuit, and the said support part is comprised by each upper end surface of a pair of said center press-contact rib.

  According to this aspect, since the support portion that supports the dark current circuit fuse from the vertically lower side in the fuse holding portion is configured using the upper end surfaces of the pair of central press-contact ribs, a simple configuration is necessary. The dark current circuit fuse can be stably supported.

  According to a third aspect of the present invention, in the first or second aspect, the fuse holding portion has a top wall that covers a top surface of the head of the dark current circuit fuse. The viewing wall is provided with a viewing window that exposes the top surface to the outside, and a lattice is provided on the viewing window.

  According to this aspect, since the viewing window is provided on the top wall of the fuse holding portion and the top surface of the head of the dark current circuit fuse is exposed to the outside through the viewing window, the dark current circuit fuse Ratings can be easily confirmed. Moreover, since the viewing window is provided with a grid, when the dark current circuit fuse is slid from the opening window of the fuse holding part, the dark current circuit fuse head enters the viewing window and tilts. Thus, it is possible to prevent the fuse holder from being attached.

  According to a fourth aspect of the present invention, in the one according to any one of the first to third aspects, one of a guide rib and a guide groove is provided on both side surfaces of the lower end portion of the insertion portion of the fuse holder. On the other hand, the other of the guide rib and the guide groove is provided on both side surfaces of the inner peripheral surface of the insertion region of the case.

  According to this aspect, one of the guide rib and the guide groove is provided on both side surfaces of the insertion portion, while the other of the guide rib and the guide groove is provided on both side surfaces of the inner peripheral surface of the insertion region. By inserting the guide rib or guide groove of the head part into the guide groove or guide rib of the main body part mounting part, the insertion part can be smoothly fitted into the insertion area, and for the dark current circuit held in the fuse holding part of the fuse holder The fuse can be securely installed in the fuse cavity.

  A fifth aspect of the present invention is the one according to any one of the first to fourth aspects, wherein the lower end surface of the insertion portion is opened downward at a position displaced to one side in the width direction. One of a concave portion and a convex portion protruding downward is provided, and on the bottom surface of the insertion region, the concave portion or the convex portion of the insertion portion inserted in a normal orientation with respect to the insertion region is opposed The other of the concave portion and the convex portion is provided at a position to be performed.

  According to this aspect, one of the concave portion and the convex portion is provided at the position displaced to the one side in the width direction on the lower end surface of the insertion portion, while the other of the concave portion and the convex portion is provided at the corresponding portion of the bottom surface of the insertion region. Therefore, for example, it is advantageously prevented that the insertion portion of the fuse holder is erroneously attached to the insertion region in the reverse direction.

  According to the present invention, the pair of central press-contact ribs that are in contact with the central portion in the width direction of the dark current circuit fuse and extend in the height direction on the front wall and the rear wall of the fuse holding portion are the dark current circuit fuses. And projecting from each other in the thickness direction. As a result, the gap necessary to enable the slide insertion of the dark current circuit fuse into the fuse holding portion can be absorbed by sandwiching the dark current circuit fuse in the thickness direction between the central press-fit ribs. The dark current circuit fuse held in the fuse holding portion can be prevented from rattling and stably held. In addition, the first side pressure welding rib and the second side pressure welding rib provided in the fuse holding portion have the same protruding height while keeping the same distance from the central pressure welding rib, and in the fuse width direction. The central press ribs are spaced apart from each other in opposite directions. As a result, the dark current circuit fuse terminal is connected to the dark current circuit when the fuse holder is slid to the connection position while suppressing an increase in insertion force when the dark current circuit fuse is slid into the fuse holder. Can be smoothly connected to the connecting terminal on the side, improving the connection workability and preventing damage to the fuse and the like.

The disassembled perspective view which shows the intermittent structure of the fuse for dark current circuits as one Embodiment of this invention. The perspective view which shows the state arrange | positioned in the cutting position where the fuse for dark current circuits was cut | disconnected from the dark current circuit. The perspective view which shows the state arrange | positioned in the connection position by which the fuse for dark current circuits was conduct-connected to the dark current circuit. The top view of the case shown in FIG. The top view of FIGS. FIG. 6 is an enlarged cross-sectional view taken along line VI-VI in FIG. It is a figure which shows the cross section of FIG. 2, Comprising: The figure corresponded in FIG. FIG. 7 is a diagram illustrating a cross-section of FIG. 3 and corresponding to FIG. 6. The perspective view of the fuse holder shown in FIG. The rear view of FIG. FIG. 10 is a plan view of FIG. 9. The right view of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, in FIG. 1 to FIG. 8, a dark current circuit fuse 14 that is conductively connected to the dark current circuit 12 in the case 10 is interrupted by using the dark current circuit fuse intermittent structure according to an embodiment of the present invention. It is shown. The case 10 accommodates and arranges bus bars and electric wires (not shown) constituting an internal circuit, while an upper case and a lower case (not shown) are stacked and assembled from both sides of the case 10 in the vertical direction. Here, the dark current circuit 12 includes a bus bar and an electric wire (not shown) constituting an internal circuit. In the following description, “upper” means the upper side in FIGS. 1 to 3, “lower” means the lower side in FIGS. 1 to 3, and “front” means left and rear in FIGS. 4-5, the length direction means the left-right direction in FIGS. 4-5, and the width direction means the up-down direction in FIGS. 4-5.

  As shown in FIGS. 1 to 3, the case 10 has a longitudinal rectangular block shape as a whole. For example, the case 10 is integrated by injection molding or the like with an insulating synthetic resin such as polypropylene (PP) or polyamide (PA). Is formed. As shown in FIGS. 1 to 5, a plurality of fuse mounting portions 20 and relay mounting portions 22 are formed in the upper surface 18 of the case 10 so as to open upward. Terminal insertion holes (not shown) are respectively formed through the bottom surfaces of the fuse mounting part 20 and the relay mounting part 22, and connection terminals 24 (FIG. 2) crimped to connection terminals provided on bus bars (not shown) or electric wire terminals (not shown). 6-8) is inserted and arranged. Then, from the upper surface 18 side of the case 10, a fuse or relay (not shown) is attached to each fuse attachment portion 20 or relay attachment portion 22, so that the tab terminal protruding from the fuse or relay is connected to the connection terminal. It is designed to be connected to the bus bars and electric wires that make up the internal circuit.

  As shown in FIGS. 1 to 8, the case 10 having such a structure also has a fuse cavity 26 in which the dark current circuit fuse 14 is accommodated and has a substantially rectangular shape in plan view. An opening is formed toward the surface. A fuse terminal insertion hole 28 is formed through the bottom surface of the fuse cavity 26, and a connection terminal provided in a bus bar (not shown) or a connection terminal 24 crimped to a wire terminal (not shown) is inserted therethrough. (See FIGS. 6 to 8). Here, for example, as shown in FIGS. 1 to 3, the dark current circuit fuse 14 is used in a state of being held in the fuse holder 30, and the dark current circuit fuse 14 is connected to the case 10. It is assembled so as to be displaceable in the insertion / extraction direction (vertical direction in FIGS. 1 to 3). More specifically, the dark current circuit fuse 14 can be held with respect to the case 10 so as to be switchable between a connection position where the dark current circuit 12 is conductively connected and a disconnect position where the dark current circuit 12 is disconnected. It is. That is, at the connection position, as shown in FIGS. 8 and 3, the dark current circuit fuse 14 is attached to the fuse cavity 26 from the upper surface 18 side of the case 10. The tab terminal 32 projecting from 14 is sandwiched between the connection terminals 24 of the dark current circuit 12 so as to be conductively connected. On the other hand, at the cutting position, as shown in FIGS. 7 and 2, the tab terminal 32 protruding from the dark current circuit fuse 14 is spaced apart and cut upward from between the connection terminals 24 of the dark current circuit 12. It has come to be.

  As shown in FIGS. 1 and 9 to 12, the fuse holder 30 includes a fuse holding portion 34 that holds the dark current circuit fuse 14 and an insertion portion 36. It is integrally formed by injection molding or the like with an insulating synthetic resin such as PP) or polyamide (PA). Here, as shown in FIGS. 1 to 8, the insertion portion 36 is provided on one long side portion side (right side in FIG. 4) of the fuse cavity 26 in the case 10 and is formed to open upward. The dark current circuit fuse 14 can be stably held at the connection position and the disconnection position by being inserted into the insertion region 38 having a substantially rectangular shape in plan view.

  More specifically, as shown in FIG. 1 and FIGS. 9 to 12, the insertion portion 36 has a substantially rectangular flat plate shape as a whole, and is a front surface 40 (FIG. 1) that faces the fuse cavity 26. The fuse holding portion 34 having a substantially rectangular box shape opening downward is directed outward through a rectangular connecting portion 42 in a front view. Projecting. Further, on both side surfaces of the lower end portion of the insertion portion 36, guide ribs 44 extending in the vertical direction with a substantially rectangular cross-sectional shape are projected outward, while on both side surfaces of the upper end portion of the insertion portion 36. Is a substantially dog-shaped elastic bending piece that protrudes upward in a cantilever shape from a position slightly spaced upward from the upper end of the guide rib 44 and faces in the width direction (left-right direction in FIG. 10). 46 is provided (see FIG. 10). Further, the lower end surface 48 of the insertion portion 36 is provided with a substantially slit-shaped recess 50 that opens toward the plate thickness direction and downward in a position displaced to one side (right side in FIG. 9) in the width direction. .

  On the other hand, as shown in FIGS. 1 and 9 to 12, the fuse holding portion 34 includes a front wall 56 that covers the front surface 54 of the head 52 of the dark current circuit fuse 14 and a rear wall 60 that covers the rear surface 58. And a side wall 64 that covers the first side surface 62, and an opening window 68 that has a substantially rectangular notch shape in a side view that opens downward on the second side surface 66 side. Further, the center portion in the width direction of the inner surfaces of the front wall 56 and the rear wall 60 of the fuse holding portion 34 is in contact with the center portion in the width direction of the dark current circuit fuse 14, and the lower end from the center portion in the height direction. A pair of central press-contact ribs 70, 70 extending toward the portion are provided so as to face each other in the thickness direction of the head 52 of the dark current circuit fuse 14 (see FIGS. 11 to 12). In addition, a support portion that supports the dark current circuit fuse 14 by abutting the flange portion 74 of the head 52 of the dark current circuit fuse 14 from below by the upper end surfaces 72 of the pair of central pressure-contacting ribs 70, 70. It is configured. In order to facilitate understanding, in FIG. 12, the dark current circuit fuse 14 is indicated by a virtual line.

  In addition, as shown in FIGS. 11 to 12, the central portion in the vertical direction of the inner surface of the rear wall 60 of the fuse holding portion 34 is located more than the central press-contact rib 70 in the width direction of the dark current circuit fuse 14. A first side press-contact rib 76 is provided at a position separated by a predetermined distance on the side wall 64 side and abuts against one end in the width direction of the dark current circuit fuse 14. Further, the central portion in the vertical direction of the inner surface of the front wall 56 of the fuse holding portion 34 is provided at a position spaced apart from the central press-contacting rib 70 by a predetermined distance in the width direction of the dark current circuit fuse 14. The second side press-contacting rib 78 that contacts the other end in the width direction of the dark current circuit fuse 14 is provided with the same protruding height as the first side press-contacting rib 76.

  As shown in FIGS. 1 and 11, the fuse holder 34 has a top wall 82 that covers the top surface 80 of the head 52 of the fuse 14 for dark current circuit. The ceiling wall 82 is provided with a substantially rectangular viewing window 84 in a plan view that exposes the top surface 80 to the outside. The viewing window 84 has a length direction (in FIG. 11). , A vertical lattice 86 is provided.

  First, the head 52 of the dark current circuit fuse 14 is attached to the fuse holder 34 of the fuse holder 30 (see FIGS. 9 to 12) having such a configuration from the opening window 68 opened to the side. . Next, the insertion portion 36 of the fuse holder 30 to which the dark current circuit fuse 14 is attached is inserted into the insertion region 38 of the case 10 from above. As shown in FIG. 1, guide grooves 88 are provided at the upper end portions of both side surfaces of the inner peripheral surface of the insertion region 38, so that they are provided on both side surfaces of the lower end portion of the insertion portion 36. By inserting the guide rib 44 into the guide groove 88, the insertion portion 36 can be smoothly inserted into the insertion region 38. In addition, the lower ends of the pair of elastic deflecting pieces 46 and 46 abut against the peripheral edge of the upper opening of the fuse cavity 26, so that the dark current circuit fuse 14 held by the fuse holding portion 34 is stabilized at the cutting position. Can be retained. Then, by pushing the dark current circuit fuse 14 held in the fuse holding portion 34 further downward from the cut position, the dark current circuit fuse 14 can be securely attached to the connection position. -ing Here, the lower end surface 48 of the insertion portion 36 is provided with a concave portion 50 that opens downward at a position displaced to one side in the width direction. On the other hand, as shown in FIG. On the bottom surface of 38, a convex portion 90 having a substantially rectangular shape in side view is provided at a position facing the concave portion 50 of the insertion portion 36 when the insertion portion 36 is inserted in a normal orientation with respect to the insertion region 38. . Therefore, for example, it is possible to advantageously prevent the insertion portion 36 of the fuse holder 30 from being erroneously attached to the insertion region 38 in the reverse direction.

  According to such an intermittent structure of the dark current circuit fuse according to the present embodiment, the insertion region 38 for accommodating the insertion portion 36 of the fuse holder 30 is provided on one long side of the fuse cavity 26 in the case 10. Yes. Further, the three surfaces 54, 58, 62 of the head 52 of the dark current circuit fuse 14 are protected on the front end portion side of the front surface 40 of the insertion portion 36, which is a surface facing the fuse cavity 26, and one side opening is provided. A fuse holding portion 34 into which the dark current circuit fuse 14 can be slid and inserted from the window 68 is provided, and a dark current is provided at the center in the width direction of the inner surface of the front wall 56 and the rear wall 60 of the fuse holding portion 34. A pair of central press-contact ribs 70, 70 that abut against the center portion in the width direction of the circuit fuse 14 and extend from the center portion in the height direction toward the lower end portion of the head 52 of the dark current circuit fuse 14. It protrudes from each other in the thickness direction. As a result, a gap necessary for allowing the dark current circuit fuse 14 to be slid into the fuse holding portion 34 is projected from the inner surfaces of the front wall 56 and the rear wall 60 of the fuse holding portion 34 so as to face each other. Absorption can be achieved by sandwiching the head 52 of the dark current circuit fuse 14 between the pair of central press-contacting ribs 70, 70. Therefore, rattling of the dark current circuit fuse 14 accommodated and held in the fuse holding portion 34 can be prevented and stably held. In addition, since the support portion that supports the dark current circuit fuse 14 from below in the fuse holding portion 34 is configured using the upper end surfaces 72 of the pair of central press-contacting ribs 70, the configuration is simple. The necessary dark current circuit fuse 14 can be stably supported.

  In addition, a first side pressure welding rib 76 provided on the inner surface of the rear wall 60 of the fuse holding portion 34 and a second side pressure welding rib 78 provided on the inner surface of the front wall 56 are separated from the central pressure welding rib 70. The distance is the same, the protrusion height is the same, and the dark current circuit fuse 14 is disposed at a position spaced in the opposite direction from the central press rib 70 in the width direction of the dark current circuit fuse 14. Accordingly, the dark current circuit fuse 14 can be reliably disposed at the center position of the fuse holding portion 34 while suppressing an increase in insertion force when the dark current circuit fuse 14 is slid into the fuse holding portion 34. It is possible. Therefore, when the dark current circuit fuse 14 held in the fuse holder 30 is slid to the connection position, the tab terminal 32 of the dark current circuit fuse 14 is smoothly connected to the connection terminal 24 on the dark current circuit 12 side. Thus, it is possible to improve the connection workability and prevent breakage of the fuse or the like. Further, a viewing window 84 is provided through the top wall 82 of the fuse holder 34, and the top surface 80 of the head 52 of the dark current circuit fuse 14 is exposed to the outside through the viewing window 84. Thus, the rating and the like of the dark current circuit fuse 14 can be easily confirmed. Further, since the viewing window 84 is provided with the grid 86, there is a problem that the head 52 of the dark current circuit fuse 14 enters the viewing window 84 and is attached to the fuse holding portion 34 in an inclined state. Has been prevented.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited at all by the specific description in this embodiment. For example, in the above embodiment, the first side press-contacting rib 76 is provided on the inner surface of the rear wall 60 of the fuse holding portion 34 and the second side press-contacting rib 78 is provided on the inner surface of the front wall 56. The wall portions (rear wall 60, front wall 56) to be used may be reversed. In the above embodiment, the guide ribs 44 are provided on both side surfaces of the lower end portion of the insertion portion 36, while the guide grooves 88 are provided on the upper end portions of both side surfaces of the insertion region 38. The guide groove 88 may be reversed. Further, in the above embodiment, the concave portion 50 is provided on the lower end surface 48 of the insertion portion 36, while the convex portion 90 is provided on the bottom surface of the insertion region 38, but the convex portion is provided on the lower end surface 48 of the insertion portion 36. While 90 is provided, the recess 50 may be provided on the bottom surface of the insertion region 38.

10: case, 12: dark current circuit, 14: fuse for dark current circuit, 24: connection terminal, 26: fuse cavity, 30: fuse holder, 34: fuse holding portion, 36: insertion portion, 38: insertion region, 44 : Guide rib, 48: Lower end surface, 50: Recess, 52: Head, 54: Front surface, 56: Front wall, 58: Rear surface, 60: Rear wall, 62: First side, 64: Side wall, 66: Second side 68: Opening window, 70: Central pressure welding rib, 72: Upper end surface (support portion), 74: Flange portion, 76: First side pressure welding rib, 78: Second side pressure welding rib, 80: Top surface, 82 : Top wall, 84: Viewing window, 86: Lattice, 88: Guide groove, 90: Projection

Claims (5)

A fuse holder for holding a dark current circuit fuse for conductively connecting the dark current circuit is assembled to a case accommodating the dark current circuit so as to be displaceable in a direction in which the dark current circuit fuse is inserted and removed. The circuit fuse is switchably held between a connection position where the circuit fuse is electrically connected to the connection terminal of the dark current circuit housed in the fuse cavity of the case and a cutting position where the dark current circuit fuse is disconnected from the connection terminal. It is possible to
A fuse holder insertion region is provided on one long side of the fuse cavity in the case, and the dark current circuit for the dark current circuit is provided on the tip side of the surface of the flat plate-like insertion part of the fuse holder facing the fuse cavity. In the intermittent structure of the fuse for the dark current circuit, the fuse holding part having the opening window on the second side surface covering the front surface, the rear surface and the first side surface of the head of the fuse is provided.
While the fuse holding portion has a front wall covering the front surface of the head of the dark current circuit fuse, a rear wall covering the rear surface, and a side wall covering the first side surface,
On the front wall and the rear wall of the fuse holding portion, a pair of central press-contact ribs that abut against the central portion in the width direction of the dark current circuit fuse and extend in the height direction include the dark current circuit fuse. And projecting opposite to each other in the thickness direction,
The dark current circuit is provided at one of the front wall and the rear wall of the fuse holding portion at a position spaced apart from the central press contact rib by a predetermined distance in the width direction of the dark current circuit fuse. On the other hand, a first side press-contacting rib that comes into contact with one end in the width direction of the fuse is provided.
The other one of the front wall and the rear wall of the fuse holding portion is provided at a position spaced apart from the central press-contact rib by the same predetermined distance in the width direction of the dark current circuit fuse by the same predetermined distance. Discontinuity of the dark current circuit fuse, wherein the second side press-contact rib contacting the other end in the width direction of the current circuit fuse is provided with the same projecting height as the first side press-contact rib. Construction.   The fuse holding portion has a support portion that supports the dark current circuit fuse by contacting the flange portion of the head of the dark current circuit fuse from below, and the pair of central press-contact ribs The intermittent structure of the fuse for a dark current circuit according to claim 1, wherein the support portion is constituted by each upper end surface of the dark current circuit.   The fuse holding part has a top wall that covers the top surface of the head of the dark current circuit fuse, and a viewing window that exposes the top surface to the outside is provided through the top wall. On the other hand, the dark current circuit fuse intermittent structure according to claim 1, wherein a grid is provided in the viewing window.   One of the guide rib and the guide groove is provided on both side surfaces of the lower end portion of the insertion portion of the fuse holder, while the other of the guide rib and the guide groove is on both side surfaces of the inner peripheral surface of the insertion region of the case. The intermittent structure of the fuse for dark current circuits of any one of Claims 1-3 provided.   In the lower end surface of the insertion portion, one of a concave portion opening downward and a convex portion protruding downward is provided at a position displaced to one side in the width direction, while the bottom surface of the insertion region, The other of the said recessed part and the said convex part is provided in the position facing the said recessed part or convex part of the said insertion part inserted by the normal orientation with respect to the said insertion area | region. The intermittent structure of the fuse for the dark current circuit described in 1.

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